Device for removing stuck drills.



F. PAUL & G. G. MITCHELL. DEVICE FOR REMOVING STUCK DRILLS. APPLICATIONFILED APR. 18, 1912. 1,055,790, Patented Mar. 11,1913.

A A am ATTORNEYS UNITED STATES PATENT OFFICE.

FREDERICK PAUL, OF HASTINGS-UPON-HUDSON, AND CHARLES C. MITCHELL, OF

MILLBROOK, NEW YORK.

DEVICE FOR REMOVING STUCK DRILLS.

Specification of Letters Patent.

Application. filed April 18. 1912.

Patented Mar. 11, 1913.

Serial No. 691,686.

To all whom it may concern Be it known that we, Fnnonmon PAUL andCHARLES C. MITCHELL, both citizens of the United States, and residents,respectively, of Hastings upon Hudson, in the county of Westchester andState of New York, and of Millbrook, in the county of Dutchess and Stateof New York, have invented a new and Improved Device for Bemoving StuckDrills, ofwhich the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved device moreespecially designed for removing drills stuck in a drill hole andarranged to permit of conveniently placing the device in position on thedrill and on the surface of the rock or ground adjacent the drill holeto insure the exertion of the power in the direction of the length ofthe drill irrespective of the unevenness of the surface.

For the purpose mentioned use is made of a hollow head or collar throughwhich passes the shank of the drill, and jaws within said hollow headand adapted to engage the drill so that when the head is raised by saidmeans then the jaws firmly grip the shank of the drill and lift the sameout of the drill hole.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in bothviews.

Figure 1 is a sectional side elevation of the device as applied, thesection being on the line 1-1 of Fig. 2; and Fig. 2 is a sectional planView of the same.

As shown in Fig. 1 the drill -A is supposed to be stuck in the drillhole B in rock or other material C, and the portion of the drill shankabove the surface of the material C passes through a hollow head or acollar D provided with a central opening D in the form of the frustum ofa cone, and in the said opening D are arranged a series of wedge-shapedjaws E having their inner faces provided with teeth E, to firmly engagethe shank of the stuck drill A, as plainly indicated in Figs. 1 and 2,and the outer faces of the said jaws E are. beveled to correspond to thewall of the opening D. The lower ends of the jaws E are engaged byboltsF extending through slots G formed a in a bottom plate G attached to thelower end of-tlie head D, so as to hold the jaws E in posltlon to permitof conveniently placmg the collar D in position on the outer end of thestuck drill A.

The upper end of the head D is provided w th a cap D screwed orotherwise removably fastenedto the head D, and the under side of thesaid cap D is engaged by a collar H held on the lower end of a screw rodH mounted to turn loosely in the cap D and screwing in anut 1 formed inthe top of a stand I, preferably of bell shape and adapted to resteither on the surface of the material C in case such surface is level,or is adapted to rest in a cup-shaped base J having a central opening Jfor the passage of the drill A. .The base J has its top surface J 2spherical while the bottom J 3 is flat and roughened so as to rest onthe surface of the material C thus supporting the stand I in verticalposition even if the surface of the material C is sloping.

The upper end of the screw rod H is provided with a collar H having anopening H for the insertion of a tool to permit the operator ofconvenientlyturning the screw rod H so as to screw the same up in thenut I thereby lifting the head D so that the jaws firmly grip the shankA of the stuck drill A thus lifting the latterwith the head D. In somecases it is desirable to use the head D on the top of the screw rod H,and for this purpose the collar H is provided with a seat K on which isadapted to be seated the collar D detached for the purpose from thelower end of the screw rod H.

It is understood that when the head D is seat-ed on the seat K and thescrew rod H is screwed upward in the nut I then the head D is lifted andwith it the stuck drill A gripped by the jaws E contained within thehead D. p

Although we have described a particular form of lifting device forthe-head D, it is evident that other suitable lifting means may beemployed'for raising he head with a (view to engage the jaws the head Don the drill A and then lift the head D with the head of a crow bar orsimilar tool to. dislodge the stuck drill A.

Havingthus described our invention, We claim as new and desire to secureby Letters Patent:

A device for removing stuck drills, comprising the combination of a baseblock having a relatively flat lower surface and a concavity in itsupper face, and being provided with an enlarged opening extendingtherethrough at the center of said concavity, a hollow bell-shaped standwholly independent of the base and opening downwardly and having itslower circular edge adapted to freely seat Within the concavity of saidbase and movable therein topermit the stand to assume perpendicularpositions at various angles with respect to the base, a drill engagingmember operating wholly within the bell-shaped stand, and means foradjusting said drill engaging member, said means operating through theupper closed end of the 20 said bell-shaped stand, substantially asdescribed.

In testimony Wherof we have signed our names to this specification inthe presence of two subscribing witnesses.

FREDERICK PAUL. CHARLES C. MITCHELL. Witnesses:

FRED GonLIoI-r, GUSTAVUS BLUHM.

